/**
* Sends an event down the protocol stack. Note that - contrary to {@link #send(Message)}, if the
* event is a message, no checks are performed whether the channel is closed or disconnected.
*
* @param evt the message to send down, encapsulated in an event
*/
public Object down(Event evt) {
if (evt == null) return null;
if (stats && evt.getType() == Event.MSG) {
sent_msgs++;
sent_bytes += ((Message) evt.getArg()).getLength();
}
return prot_stack.down(evt);
}
/**
* handle the UP event.
*
* @param evt - the event being send from the stack
*/
public void up(Event evt) {
passUp(evt);
switch (evt.getType()) {
case Event.CONFIG:
passUp(evt);
if (Trace.trace) {
Trace.info("UDP.up()", "received CONFIG event: " + evt.getArg());
}
handleConfigEvent((HashMap) evt.getArg());
return;
}
passUp(evt);
}
protected void _connect(Event connect_event) throws Exception {
try {
down(connect_event);
} catch (Throwable t) {
stopStack(true, false);
state = State.OPEN;
init();
throw new Exception("connecting to channel \"" + connect_event.getArg() + "\" failed", t);
}
}
public Object up(Event evt) {
Message msg;
Address dst, src;
Unicast2Header hdr;
switch (evt.getType()) {
case Event.MSG:
msg = (Message) evt.getArg();
dst = msg.getDest();
if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) // only handle unicast messages
break; // pass up
// changed from removeHeader(): we cannot remove the header because if we do loopback=true
// at the
// transport level, we will not have the header on retransmit ! (bela Aug 22 2006)
hdr = (Unicast2Header) msg.getHeader(this.id);
if (hdr == null) break;
src = msg.getSrc();
switch (hdr.type) {
case Unicast2Header.DATA: // received regular message
handleDataReceived(src, hdr.seqno, hdr.conn_id, hdr.first, msg, evt);
return null; // we pass the deliverable message up in handleDataReceived()
case Unicast2Header.XMIT_REQ: // received ACK for previously sent message
handleXmitRequest(src, hdr.seqno, hdr.high_seqno);
break;
case Unicast2Header.SEND_FIRST_SEQNO:
handleResendingOfFirstMessage(src, hdr.seqno);
break;
case Unicast2Header.STABLE:
stable(msg.getSrc(), hdr.conn_id, hdr.seqno, hdr.high_seqno);
break;
default:
log.error("UnicastHeader type " + hdr.type + " not known !");
break;
}
return null;
}
return up_prot.up(evt); // Pass up to the layer above us
}
void handleDownEvent(Event evt) {
switch (evt.getType()) {
case Event.TMP_VIEW:
case Event.VIEW_CHANGE:
synchronized (members) {
members.removeAllElements();
Vector tmpvec = ((View) evt.getArg()).getMembers();
for (int i = 0; i < tmpvec.size(); i++) {
members.addElement(tmpvec.elementAt(i));
}
}
break;
case Event.GET_LOCAL_ADDRESS: // return local address -> Event(SET_LOCAL_ADDRESS, local)
passUp(new Event(Event.SET_LOCAL_ADDRESS, local_addr));
break;
case Event.CONNECT:
group_addr = (String) evt.getArg();
udp_hdr = new UdpHeader(group_addr);
// removed March 18 2003 (bela), not needed (handled by GMS)
// changed July 2 2003 (bela): we discard CONNECT_OK at the GMS level anyway, this might
// be needed if we run without GMS though
passUp(new Event(Event.CONNECT_OK));
break;
case Event.DISCONNECT:
passUp(new Event(Event.DISCONNECT_OK));
break;
case Event.CONFIG:
if (Trace.trace) {
Trace.info("UDP.down()", "received CONFIG event: " + evt.getArg());
}
handleConfigEvent((HashMap) evt.getArg());
break;
}
}
/**
* Caller by the layer above this layer. Usually we just put this Message into the send queue and
* let one or more worker threads handle it. A worker thread then removes the Message from the
* send queue, performs a conversion and adds the modified Message to the send queue of the layer
* below it, by calling Down).
*/
public void down(Event evt) {
Message msg;
Object dest_addr;
if (evt.getType() != Event.MSG) { // unless it is a message handle it and respond
handleDownEvent(evt);
return;
}
// ****************** profiling ******************
/*if(num_msgs == 0) {
start=System.currentTimeMillis();
num_msgs++;
}
else if(num_msgs >= 1000) {
stop=System.currentTimeMillis();
long total_time=stop-start;
double msgs_per_msec=num_msgs / (double)total_time;
if(Trace.trace)
Trace.info("UDP.down.profile()",
"total_time=" + total_time + ", msgs/ms=" + msgs_per_msec);
num_msgs=0;
}
else {
num_msgs++;
}*/
// ****************** profiling ******************
msg = (Message) evt.getArg();
if (udp_hdr != null && udp_hdr.group_addr != null) {
// added patch by Roland Kurmann (March 20 2003)
msg.putHeader(name, udp_hdr);
}
dest_addr = msg.getDest();
// Because we don't call Protocol.passDown(), we notify the observer directly (e.g.
// PerfObserver).
// This way, we still have performance numbers for UDP
if (observer != null) {
observer.passDown(evt);
}
if (dest_addr == null) { // 'null' means send to all group members
if (ip_mcast) {
if (mcast_addr == null) {
Trace.error(
"UDP.down()",
"dest address of message is null, and "
+ "sending to default address fails as mcast_addr is null, too !"
+ " Discarding message "
+ Util.printEvent(evt));
return;
}
// if we want to use IP multicast, then set the destination of the message
msg.setDest(mcast_addr);
} else {
// sends a separate UDP message to each address
sendMultipleUdpMessages(msg, members);
return;
}
}
try {
sendUdpMessage(msg);
} catch (Exception e) {
Trace.error("UDP.down()", "exception=" + e + ", msg=" + msg + ", mcast_addr=" + mcast_addr);
}
}
public Object down(Event evt) {
switch (evt.getType()) {
case Event.MSG: // Add UnicastHeader, add to AckSenderWindow and pass down
Message msg = (Message) evt.getArg();
Address dst = msg.getDest();
/* only handle unicast messages */
if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) break;
if (!started) {
if (log.isTraceEnabled())
log.trace("discarded message as start() has not yet been called, message: " + msg);
return null;
}
SenderEntry entry = send_table.get(dst);
if (entry == null) {
entry = new SenderEntry(getNewConnectionId());
SenderEntry existing = send_table.putIfAbsent(dst, entry);
if (existing != null) entry = existing;
else {
if (log.isTraceEnabled())
log.trace(
local_addr
+ ": created connection to "
+ dst
+ " (conn_id="
+ entry.send_conn_id
+ ")");
if (cache != null && !members.contains(dst)) cache.add(dst);
}
}
long seqno = -2;
short send_conn_id = -1;
Unicast2Header hdr;
entry.lock(); // threads will only sync if they access the same entry
try {
seqno = entry.sent_msgs_seqno;
send_conn_id = entry.send_conn_id;
hdr = Unicast2Header.createDataHeader(seqno, send_conn_id, seqno == DEFAULT_FIRST_SEQNO);
msg.putHeader(this.id, hdr);
entry.sent_msgs.addToMessages(
seqno, msg); // add *including* UnicastHeader, adds to retransmitter
entry.sent_msgs_seqno++;
entry.update();
} finally {
entry.unlock();
}
if (log.isTraceEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append(local_addr)
.append(" --> DATA(")
.append(dst)
.append(": #")
.append(seqno)
.append(", conn_id=")
.append(send_conn_id);
if (hdr.first) sb.append(", first");
sb.append(')');
log.trace(sb);
}
try {
down_prot.down(evt);
num_msgs_sent++;
num_bytes_sent += msg.getLength();
} catch (Throwable t) {
log.warn("failed sending the message", t);
}
return null; // we already passed the msg down
case Event.VIEW_CHANGE: // remove connections to peers that are not members anymore !
View view = (View) evt.getArg();
List<Address> new_members = view.getMembers();
Set<Address> non_members = new HashSet<Address>(send_table.keySet());
non_members.addAll(recv_table.keySet());
synchronized (members) {
members.clear();
if (new_members != null) members.addAll(new_members);
non_members.removeAll(members);
if (cache != null) {
cache.removeAll(members);
}
}
if (!non_members.isEmpty()) {
if (log.isTraceEnabled()) log.trace("removing non members " + non_members);
for (Address non_mbr : non_members) removeConnection(non_mbr);
}
break;
case Event.SET_LOCAL_ADDRESS:
local_addr = (Address) evt.getArg();
break;
}
return down_prot.down(evt); // Pass on to the layer below us
}
public Object down(Event evt) {
switch (evt.getType()) {
case Event.MSG: // Add UnicastHeader, add to AckSenderWindow and pass down
Message msg = (Message) evt.getArg();
Address dst = msg.getDest();
/* only handle unicast messages */
if (dst == null || msg.isFlagSet(Message.NO_RELIABILITY)) break;
if (!running) {
if (log.isTraceEnabled())
log.trace("discarded message as start() has not yet been called, message: " + msg);
return null;
}
SenderEntry entry = send_table.get(dst);
if (entry == null) {
entry = new SenderEntry(getNewConnectionId());
SenderEntry existing = send_table.putIfAbsent(dst, entry);
if (existing != null) entry = existing;
else {
if (log.isTraceEnabled())
log.trace(
local_addr
+ ": created connection to "
+ dst
+ " (conn_id="
+ entry.send_conn_id
+ ")");
if (cache != null && !members.contains(dst)) cache.add(dst);
}
}
short send_conn_id = entry.send_conn_id;
long seqno = entry.sent_msgs_seqno.getAndIncrement();
long sleep = 10;
while (running) {
try {
msg.putHeader(
this.id,
Unicast2Header.createDataHeader(seqno, send_conn_id, seqno == DEFAULT_FIRST_SEQNO));
entry.sent_msgs.add(seqno, msg); // add *including* UnicastHeader, adds to retransmitter
if (conn_expiry_timeout > 0) entry.update();
break;
} catch (Throwable t) {
if (!running) break;
if (log.isWarnEnabled()) log.warn("failed sending message", t);
Util.sleep(sleep);
sleep = Math.min(5000, sleep * 2);
}
}
if (log.isTraceEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append(local_addr)
.append(" --> DATA(")
.append(dst)
.append(": #")
.append(seqno)
.append(", conn_id=")
.append(send_conn_id);
if (seqno == DEFAULT_FIRST_SEQNO) sb.append(", first");
sb.append(')');
log.trace(sb);
}
try {
down_prot.down(evt);
num_msgs_sent++;
} catch (Throwable t) {
log.warn("failed sending the message", t);
}
return null; // we already passed the msg down
case Event.VIEW_CHANGE: // remove connections to peers that are not members anymore !
View view = (View) evt.getArg();
List<Address> new_members = view.getMembers();
Set<Address> non_members = new HashSet<Address>(send_table.keySet());
non_members.addAll(recv_table.keySet());
members = new_members;
non_members.removeAll(new_members);
if (cache != null) cache.removeAll(new_members);
if (!non_members.isEmpty()) {
if (log.isTraceEnabled()) log.trace("removing non members " + non_members);
for (Address non_mbr : non_members) removeConnection(non_mbr);
}
break;
case Event.SET_LOCAL_ADDRESS:
local_addr = (Address) evt.getArg();
break;
}
return down_prot.down(evt); // Pass on to the layer below us
}
/**
* Callback method <br>
* Called by the ProtocolStack when a message is received.
*
* @param evt the event carrying the message from the protocol stack
*/
public Object up(Event evt) {
switch (evt.getType()) {
case Event.MSG:
Message msg = (Message) evt.getArg();
if (stats) {
received_msgs++;
received_bytes += msg.getLength();
}
// discard local messages (sent by myself to me)
if (discard_own_messages
&& local_addr != null
&& msg.getSrc() != null
&& local_addr.equals(msg.getSrc())) return null;
break;
case Event.VIEW_CHANGE:
View tmp = (View) evt.getArg();
if (tmp instanceof MergeView) my_view = new View(tmp.getViewId(), tmp.getMembers());
else my_view = tmp;
// Bela&Vladimir Oct 27th,2006 (JGroups 2.4): we need to set connected=true because a client
// can
// call channel.getView() in viewAccepted() callback invoked on this thread (see
// Event.VIEW_CHANGE handling below)
// not good: we are only connected when we returned from connect() - bela June 22 2007
// Changed: when a channel gets a view of which it is a member then it should be
// connected even if connect() hasn't returned yet ! (bela Noc 2010)
if (state != State.CONNECTED) state = State.CONNECTED;
break;
case Event.CONFIG:
Map<String, Object> cfg = (Map<String, Object>) evt.getArg();
if (cfg != null) {
if (cfg.containsKey("state_transfer")) {
state_transfer_supported = (Boolean) cfg.get("state_transfer");
}
if (cfg.containsKey("flush_supported")) {
flush_supported = (Boolean) cfg.get("flush_supported");
}
}
break;
case Event.GET_STATE_OK:
StateTransferResult result = (StateTransferResult) evt.getArg();
if (up_handler != null) {
try {
Object retval = up_handler.up(evt);
state_promise.setResult(new StateTransferResult());
return retval;
} catch (Throwable t) {
state_promise.setResult(new StateTransferResult(t));
}
}
if (receiver != null) {
try {
if (result.hasBuffer()) {
byte[] tmp_state = result.getBuffer();
ByteArrayInputStream input = new ByteArrayInputStream(tmp_state);
receiver.setState(input);
}
state_promise.setResult(result);
} catch (Throwable t) {
state_promise.setResult(new StateTransferResult(t));
}
}
break;
case Event.STATE_TRANSFER_INPUTSTREAM_CLOSED:
state_promise.setResult((StateTransferResult) evt.getArg());
break;
case Event.STATE_TRANSFER_INPUTSTREAM:
// Oct 13,2006 moved to down() when Event.STATE_TRANSFER_INPUTSTREAM_CLOSED is received
// state_promise.setResult(is != null? Boolean.TRUE : Boolean.FALSE);
if (up_handler != null) return up_handler.up(evt);
InputStream is = (InputStream) evt.getArg();
if (is != null && receiver != null) {
try {
receiver.setState(is);
} catch (Throwable t) {
throw new RuntimeException("failed calling setState() in state requester", t);
}
}
break;
case Event.STATE_TRANSFER_OUTPUTSTREAM:
if (receiver != null && evt.getArg() != null) {
try {
receiver.getState((OutputStream) evt.getArg());
} catch (Exception e) {
throw new RuntimeException("failed calling getState() in state provider", e);
}
}
break;
case Event.GET_LOCAL_ADDRESS:
return local_addr;
default:
break;
}
// If UpHandler is installed, pass all events to it and return (UpHandler is e.g. a building
// block)
if (up_handler != null) return up_handler.up(evt);
if (receiver != null) return invokeCallback(evt.getType(), evt.getArg());
return null;
}